Fairly simple to replicate: In Model Space, do Draw -> Mesh -> 2D Solid and place some. So far so good. Now switch to SheetSpace and create a top orthoganol ViewPort and a NW isometric ViewPort. In SheetSpace these solids only properly appear in ortho ViewPorts but are invisible in the isometric ViewPorts. Is this expected behavior? Is my expectation beyond the capabilities of DraftSight?